Finding the Fourth Proportional to 2,099.40, 3,146.46 and 1,231.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.40 : 3,146.46 = 1,231.56 : x
2. Step 2: Convert to fraction form
   2,099.40/3,146.46 = 1,231.56/x
3. Step 3: Cross multiply
   2,099.40x = 3,146.46 × 1,231.56
4. Step 4: Simplify right side
   2,099.40x = 3,875,054.28
5. Step 5: Solve for x
   x = 3,875,054.28/2,099.40
6. Step 6: Final answer
   x = 1,845.79